Jules gfjlardin



(No Model.)

J. GELARDIN.

- SAW FRAME.

No. 527,845; Patented Oct. 23. 1894.

UNITED STATES PATENT OFFICE.

JULEs GELARDIN, OF PARIS, FRANCE.

- SAW-FRAM E.

SPECIFICATION forming part of Letters Patent No. 527,845, dated October23, 1894.

Application filedMarch 3, 1894, Serial No. 502,258- (No model.) Patentedin France August 2, 1892, No. 223,409; in Switzerlaud February 13,1893,1113. 6,326; in England February 14, 1893, No- 3,318, and inGermany May 18,1898,No. 68,680.

To all whom it may concern:

Be it known that I, J ULES GELARDIN, a citizen of the Republic of.France, residing at No. 159 Rue du Temple, Paris, France, have inventedcertain new and useful Improvements in Saw-Frames with New Fastening andNew Tension Devices, of which the following is a specification.

This invention has been patented to me in France, No. 223,409, datedAugust 2,1892; in Switzerland, No. 6,326, dated February 13, 1893 ,inEngland,No. 3,318,dated February 14, 1893, and in Germany, No. 68,680,dated May 18, 1893.

My invention relates to saw frames and is designed to dispense with thelocking screws of the ordinary jaws which are difficult to operate andwear out very rapidly and to render unnecessary a nut screw foradjusting the tension of the blade.

My saw frame includes a fastening device for the top of the blade and atension device which furnishes an almost instantaneous tension by theswinging of a lever.

In the accompanying drawings Figure 1, is the saw frame with blade, thesaw being stretched. Figs. 2 and 3 show different positions of thetension device. Fig. 4, shows a modification of the stretcher; Fig. 5, aprofile view when stretched, and Fig. 6, a similar View when notstretched of the mechanism of Fig. 4. Fig. 7, is a sliding eye guidingthe piece to which the lower part of the blade is fastened. Figs. 8, 9,10, ll, 12 and 13 are the various modifications used for holding theupper and lower portions of the blade, according to its size.

The saw frame consists of a body of iron or steel wire, round, square orflat. It can be of one or more pieces according to the shape or thequality of the material. The prolongation of the body is suitably bentto form the handle of the saw frame. At the angles D and E or over thewhole of the frame the material can be hammered so as to make it stifierand when the body is made of steel the latter can be tempered. A crosspiece b-=-b provided with three holes is located on top of the handle.Thearms,C' 0 pass through the first and through the last of said holeswhich looks it in place.

While the third, at the center is square acting as a guide for the pieceG which slides through the same. The cross piece b-b, can be replaced bya sliding eye, Fig. 7, which can be constructed by turning the extremityof the arm 0" of the handle overasquare mandrel.

The lower part of the blade is fastened to the piece G. When the sawsare narrow said piece G is provided with a tapering hole to receive theend of the saw where it is held by means of a conical pin 0 (Figs. 1 and8) For wider blades (Figs. 9 and 10) a slit is formed in the end of thepart G and the saw end is looked upon its face by the conical pin 0.

For narrow blad es or for those with stronger teeth, the extremity ofthe piece G is slightly conical and split in the center and encircled bythe ring m which brings the separated parts together by its being pushedin and squeezes the blade between the said parts separated by the split.The ring m being wedged upon the cone of the piece G stays in its placewhere it has been pressed down but for safety a pressure screw V can beadded. (See Figs. 4 and 13.)

The top of the bladeis secured as follows: The extremity of the bodyends in A by a conical part split in the center, Fig. 11. The width ofthe split is regulated by a nuta the pressing or screwing down'of which(Figs. 1 and 11) secures the blade.

The tension of the blade is obtained by a swinging tightener followingthe axle of the blade. It can be constructed with two or three arms. InFigs. 1, 2 and 3 it is formed of three arms P. R. M. the extremities ofwhich are fastened to a runner K. The other extremity 5 of the arm R isfixed to the handle while the extremity 4 of the arm P is connected withthe piece G. The result of the construction is that by turning the leverM (Figs. 2 and 3) I displace the inner extremities l and 3 of the armsP. R bringing them into the position of Fig. 2 to tighten the bladegildd to the position of Fig. 3 to loosen the In the modification ofFigs. 4, 5 and 6 the arm R of Figs. 1, 2 and 3 is dispensed with and therunner K finds its resting point upon zoo the axle 0-s upon which itpivots said axle extending between the two'sides C C" of the handle.

Figs. 5 and 6 show the change of position of the parts the-lever M beingturned to swing the runner K upon its pivot.

I claim as my invention- 1. In combination in a saw, the frame, the sawblade, the piece G secured to one end of the blade, said frame having aslitted'forwardly extending end A provided with a screw thread, and thenut thereon to clamp the slit end and the end of the saw blade together,substantially as described.

2. In combination in a saw, the frame comprising the bends D E, theforwardly bent end A, and the handle comprising a prolonga tion oftheframe formed of the sides 0' 0",

handle, saidstraining device comprising the oscillating runner Kconnected with the handle of the saw between the sides 0 O, the link Pconnecting the same with the piece G, and the handle connected to therunner substantially as described.

In witness whereof I havehereunto set my hand inpresence of twowitnesses.

J ULES GELARDIN. Witnesses:

MAURICE TIEPLER. CLYDE SHROPSHIRE.

